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What is the function of a Field Coil?


A field coil is essentially an electromagnet used to generate magnetic field in a motor. The coil which is wound or plugged directly on the pole, is a wire through which the current flows.
Field coils are available in numerous versions- from insulated and flat to round and wide, from those wound on the sting of bare copper to those soldered together with individual copper elements. The individual coils are switched along so that they form an altering North and South pole, when excited by direct current. 
The magnetic path of the coil is characterised by poles and its location at equal angles around the armature (the angle at which magnetic field lines pass from the field coil to armature or vice versa). The field coils (and armatures) are classified by the number of poles they have.

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